[justinclift]

Interesting. If they do use the device MAC address, that could turn out to be really easy. :)

Mac address spoofing is super easy (basic admin task almost) on most *nix's, though (from hazy memory) it does depend on the network card capabilities and driver.

Looking at the general info page for the EdgeRouter X, it seems to run something called "EdgeOS":

https://www.ubnt.com/edgemax/edgerouter-x/

That has a user guide available:

https://dl.ubnt.com/guides/edgemax/EdgeOS_UG.pdf

Page 4 of the user guide says:

  CLI
  Advanced users can make configuration changes using 
  Linux commands.

If EdgeOS really is Linux based, you might be in luck. :)